#include "server.hpp"
#include <stdexcept>
#include <boost/thread/thread.hpp>
#include <boost/bind.hpp>
#include <boost/shared_ptr.hpp>

namespace http {
namespace server2 {

io_service_pool::io_service_pool(std::size_t pool_size)
  : next_io_service_(0)
{
    if (pool_size == 0)
        throw std::runtime_error("io_service_pool size is 0");

    // Give all the io_services work to do so that their run() functions will not
    // exit until they are explicitly stopped.
    for (std::size_t i = 0; i < pool_size; ++i)
    {
          io_service_ptr io_service(new boost::asio::io_service);
          work_ptr work(new boost::asio::io_service::work(*io_service));
          io_services_.push_back(io_service);
          work_.push_back(work);
    }
}

void io_service_pool::run()
{
    // Create a pool of threads to run all of the io_services.
    std::vector<boost::shared_ptr<boost::thread> > threads;
    for (std::size_t i = 0; i < io_services_.size(); ++i)
    {
        boost::shared_ptr<boost::thread> thread(new boost::thread(
              boost::bind(&boost::asio::io_service::run, io_services_[i])));
        threads.push_back(thread);
    }

    // Wait for all threads in the pool to exit.
    for (std::size_t i = 0; i < threads.size(); ++i)
        threads[i]->join();
}

void io_service_pool::stop()
{
    // Explicitly stop all io_services.
    for (std::size_t i = 0; i < io_services_.size(); ++i)
        io_services_[i]->stop();
}

boost::asio::io_service& io_service_pool::get_io_service()
{
  // Use a round-robin scheme to choose the next io_service to use.
  boost::asio::io_service& io_service = *io_services_[next_io_service_];
  ++next_io_service_;
  if (next_io_service_ == io_services_.size())
    next_io_service_ = 0;
  return io_service;
}

} // namespace server2
} // namespace http
